Chloride transmission in silane composite emulsion-protected concrete under the coupling effect of flexural loading and wetting–drying cycles / Mengjun Hu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 3 (05/2024) . - p. 1017-1030 Titre : Chloride transmission in silane composite emulsion-protected concrete under the coupling effect of flexural loading and wetting–drying cycles Type de document : texte imprimé Auteurs : Mengjun Hu, Auteur ; Shaochun Li, Auteur ; Xu Chen, Auteur ; Shiyu Sui, Auteur ; Yongjuan Geng, Auteur ; Jialin Jiang, Auteur ; Zhijun Liu, Auteur Année de publication : 2024 Article en page(s) : p. 1017-1030 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorures Essais (technologie) Isobutyltriethoxysilane Matériaux cimentaires -- Revêtements protecteurs Orthosilicate de tétraéthyle L'orthosilicate de tétraéthyle (TEOS) est un composé chimique de formule Si(OCH2CH3)4 ou plus simplement Si(OEt)4; l'abréviation TEOS (pour tetraethylorthosilicate) est généralement utilisée dans l'industrie du sol-gel, où il est intensivement étudié. La majorité des études en sol-gel pour des sols de silices ont utilisé ce produit comme précurseur. Le TEOS est généralement produit par alcoolyse du tétrachlorure de silicium SiCl4 dans de l'éthanol CH3CH2OH : SiCl4 + 4 CH3CH2OH → Si(OCH2CH3)4 + 4 HCl. Il est utilisé pour la réticulation de silicones et possède certaines applications comme précurseur du dioxyde de silicium SiO2 dans l'industrie des semi-conducteurs6 dans le cadre d'une réaction sol-gel. La propriété remarquable du TEOS est en effet de former du SiO2 par simple hydrolyse en libérant de l'éthanol CH3CH2OH : Si(OCH2CH3)4 + 2 H2O → SiO2 + 4 CH3CH2OH. Oxyde de graphène Réaction de couplage Revêtements en phase aqueuse Revêtements organiques Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : The coupling effect of flexural loading and wetting–drying cycles on chloride transmission in silane composite emulsion-protected concrete is presented in this paper. Graphene oxide/isobutyltriethoxysilane (GS) and tetraethyl orthosilicate/isobutyltriethoxysilane (TS) composite emulsion was prepared to obstruct the penetration of chloride, and the influence of flexural loading and exposure time on the protective effect were mainly considered. The results show that the content and diffusion coefficient of chloride are affected significantly by flexural loading, exposure age, and protective emulsion. Loads with different stress ratios affect the internal transmission of chloride by changing the compactness of concrete. The prolongation of the exposure age leads to the accumulation of chloride, thereby increasing the internal chloride contents of concrete. The GS/TS composite emulsion reacts with the hydration products to form the hydrophobic layer, which can significantly prevent the penetration of chloride. In particular, the protective performance of GS under low stress ratios is better than that of TS, while under high stress levels, TS has better resistance to chloride erosion. Relatively speaking, the long-term protective effect of GS is better than that of TS. Note de contenu : - MATERIALS AND METHODS : Materials - Test methods - RESULTS AND DISCUSSION : The content of chloride in silane-protected concrete subjected to flexural loading and wetting-drying cycles - Diffusion coefficient of chloride in silane-protected concrete subjected to flexural loading and wetting-drying cycles - Table 1 : Chemical composition of cement (%) - Table 2 : Materials for preparing the silane composite emulsions - Fig. 1 : Preparation of composite emulsion DOI : https://doi.org/10.1007/s11998-023-00869-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00869-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41074 [article]

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Efficacy and mechanism of GO/IBTS coating against microbial fouling of concrete surfaces in marine tidal areas / Shaochun Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 875-885 Titre : Efficacy and mechanism of GO/IBTS coating against microbial fouling of concrete surfaces in marine tidal areas Type de document : texte imprimé Auteurs : Shaochun Li, Auteur ; Jun Liu, Auteur ; Yongjuan Geng, Auteur ; Ang Liu, Auteur ; Ailing Xu, Auteur ; Dongshuai Hou, Auteur ; Xiulu Lang, Auteur Année de publication : 2022 Article en page(s) : p. 875-885 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion microbienne Isobutyltriethoxysilane Matériaux cimentaires Oxyde de graphène Revêtements antisalissures Revêtements organiques Silanes Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, GO/IBTS composite emulsion was prepared by sol–gel method with graphene oxide (GO) and isobutyltriethoxysilane (IBTS) as raw materials. GO/IBTS composite coating was constructed on the surface of concrete blocks, which were then placed in a marine tidal area for biological fouling experiment. The results show that the GO/IBTS composite emulsion can ensure long-term hydrophobicity of the concrete surface, preventing the adhesion of marine microorganisms and effectively inhibiting the formation of microbial biofilms. High-throughput DNA sequencing results show that the GO/IBTS composite coating can reduce the species richness and community diversity of microorganisms on the concrete surface, especially the abundance of Desulfobacterota and Firmicutes species, which can corrode concrete. The degree of microbial contamination was significantly reduced, and the bacterial community structure was improved by the coating. Microscopy results show that the GO/IBTS composite coating reduces the degree of carbonization of concrete, improves the microstructure of the concrete surface, and reduces the degree of microbial contamination on concrete. Note de contenu : - MATERIALS AND METHODS : Raw materials and preparation of a GO/IBTS composite emulsion - Concrete preparation - Contact angle measurements - Microbial extraction from concrete surfaces - Illumina MiSeq sequencing and data analysis - Analysis of biofilms on the concrete surface - pH values of the concrete surface and analysis of the corrosion product composition - Analysis of the micromorphology of the concrete surface - RESULTS AND DISCUSSION : Influence of the GO/IBTS composite coating on the contact angle of the concrete surface - Influence of the GO/IBTS composite coating on the microbial α-diversity indices for the concrete surface - Influence of the GO/IBTS composite coating on the composition of the microbial community of the concrete surface Influence of the GO/IBTS composite coating on the adhesion of bacteria to the concrete surface - The influence of the GO/IBTS composite coating on the phase composition of the concrete surface The influence of the GO/IBTS composite coating on the surface micromorphology of concrete - Table 1 : Raw materials for the preparation of GO/IBTS composite emulsions - Table 2 : Mixing ratios of prepared concrete (kg/m3) - Table 3 : Bacterial α-diversity indices for the concrete surface - Table 4 : pH values of the concrete surfaces DOI : https://doi.org/10.1007/s11998-021-00565-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00565-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38082 [article]

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